Organizer-like reticular stromal cell layer common to adult secondary lymphoid organs.
Mesenchymal stromal cells are crucial components of secondary lymphoid organs (SLOs). Organogenesis of SLOs involves specialized stromal cells, designated lymphoid tissue organizer (LTo) in the embryonic anlagen; in the adult, several distinct stromal lineages construct elaborate tissue architecture and regulate lymphocyte compartmentalization. The relationship between the LTo and adult stromal cells, however, remains unclear, as does the precise number of stromal cell types that constitute mature SLOs are unclear. From mouse lymph nodes, we established a VCAM-1(+)ICAM-1(+)MAdCAM-1(+) reticular cell line that can produce CXCL13 upon LTbetaR stimulation and support primary B cell adhesion and migration in vitro. A similar stromal population sharing many characteristics with the LTo, designated marginal reticular cells (MRCs), was found in the outer follicular region immediately underneath the subcapsular sinus of lymph nodes. Moreover, MRCs were commonly observed at particular sites in various SLOs even in Rag2(-/-) mice, but were not found in ectopic lymphoid tissues, suggesting that MRCs are a developmentally determined element. These findings lead to a comprehensive view of the stromal composition and architecture of SLOs.
Katakai
Tomoya
T
Center for Genomic Medicine, Graduate School of Medicine, Kyoto University, Japan. katakait@takii.kmu.ac.jp
Suto
Hidenori
H
Sugai
Manabu
M
Gonda
Hiroyuki
H
Togawa
Atsushi
A
Suematsu
Sachiko
S
Ebisuno
Yukihiko
Y
Katagiri
Koko
K
Kinashi
Tatsuo
T
Shimizu
Akira
A
D000375:Aging / Q000276:immunology; D000818:Animals; D000831:Animals, Newborn; D001402:B-Lymphocytes / Q000166:cytology / Q000276:immunology; D002460:Cell Line; D045744:Cell Line, Tumor; D002465:Cell Movement / Q000235:genetics; D054382:Chemokine CXCL13 / Q000096:biosynthesis; D005347:Fibroblasts / Q000276:immunology / Q000378:metabolism; D006801:Humans; D008221:Lymphoid Tissue / Q000166:cytology* / Q000196:embryology / Q000276:immunology* / Q000378:metabolism; D053259:Lymphotoxin beta Receptor / Q000502:physiology; D008648:Mesoderm / Q000166:cytology* / Q000276:immunology* / Q000378:metabolism; D051379:Mice; D008807:Mice, Inbred BALB C; D008817:Mice, Mutant Strains; D017346:Protein Serine-Threonine Kinases / Q000502:physiology; D015398:Signal Transduction / Q000276:immunology; D017154:Stromal Cells / Q000166:cytology / Q000276:immunology / Q000378:metabolism; D000097782:NF-kappaB-Inducing Kinase
D054382:Chemokine CXCL13; D053259:Lymphotoxin beta Receptor; D017346:Protein Serine-Threonine Kinases; D000097782:NF-kappaB-Inducing Kinase